Introduction
Color change is a common and undesirable issue for manufacturers using plastic injection molded parts. There can be several causes for color change in plastic parts and it is important to identify and remediate the cause or causes in order to maintain consistent quality. This article will discuss the common root causes of color change in plastic injection molded parts and provide possible solutions.
What causes color change in plastic injection molded parts?
It is not uncommon for plastic injection molded parts to experience a change in color due to a number of different factors. The most common causes of color change include differences in temperature, incorrect ratios of material components, the use of different additives, and decomposition of the plastic due to prolonged exposure to direct sunlight or ultraviolet rays.
Temperature
Temperature variations can play a significant role in the color of a plastic injection molded part. As the material is heated to the proper molding temperature, its color can change. Furthermore, if the ambient temperature suddenly fluctuates, the molding temperature can also change and it can cause the plastic to take on a different color.
Material Ratio
The ratios of the components that make up the plastic material can have an effect on the color of a part. Components such as resins, pigments, fillers, and plasticizers all interact with one another and can affect the color of the finished product. It is important to use the same ratios when reproducing a part in order to maintain consistent results.
Additives
It is also important to consider how different additives can affect the color of a finished part. Additives such as flame retardants, catalysts, and stabilizers can all influence the color of a part. It is essential that these additives are used in the right proportion to avoid any unwanted color changes in the finished product.
Decomposition
Lastly, the decomposition of the plastic material can lead to discoloration in injection molded parts. This can be caused by prolonged exposure to direct sunlight or ultraviolet rays, which can cause the breakdown of the resin molecules and cause the plastic material to take on a yellowish color.
Conclusion
It is important for manufacturers to identify and remediate any potential causes of color change in order to maintain consistent quality. The common root causes of color change in plastic injection molded parts include differences in temperature, incorrect ratios of material components, the use of different additives, and decomposition due to prolonged exposure to direct sunlight or ultraviolet rays. By understanding these root causes, it can help manufacturers find the most appropriate solution for their specific application.
